基于局域表面等离子体共振和亥姆霍兹共振结合的双频宽角超材料完美吸收体。

Dual-band wide-angle metamaterial perfect absorber based on the combination of localized surface plasmon resonance and Helmholtz resonance.

机构信息

State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, P. O. Box 30, Chengdu, 610209, China.

University of Chinese Academy of Sciences, No. 19(A) Yuquan Road, Shijingshan District, Beijing, 100049, China.

出版信息

Sci Rep. 2017 Jul 18;7(1):5652. doi: 10.1038/s41598-017-06087-1.

DOI:10.1038/s41598-017-06087-1

PMID:28720892

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5515913/

Abstract

In this article, a dual-band wide-angle metamaterial perfect absorber is proposed to achieve absorption at the wavelength where laser radar operates. It is composed of gold ring array and a Helmholtz resonance cavity spaced by a Si dielectric layer. Numerical simulation results reveal that the designed absorber displays two absorption peaks at the target wavelength of 10.6 μm and 1.064 μm with the large frequency ratio and near-unity absorptivity under the normal incidence. The wide-angle absorbing property and the polarization-insensitive feature are also demonstrated. Localized surface plasmons resonance and Helmholtz resonance are introduced to analyze and interpret the absorbing mechanism. The designed perfect absorber can be developed for potential applications in infrared stealth field.

摘要

本文提出了一种双频宽带超材料完美吸收体，以实现激光雷达工作波长处的吸收。它由金环阵列和一个由 Si 介电层隔开的亥姆霍兹共振腔组成。数值模拟结果表明，在正常入射下，设计的吸收体在目标波长 10.6μm 和 1.064μm 处显示出两个吸收峰，具有大的频率比和近 1 的吸收率。还证明了宽角度吸收特性和偏振不敏感特性。引入局域表面等离子体共振和亥姆霍兹共振来分析和解释吸收机制。所设计的完美吸收体可应用于红外隐身领域。